"Researchers propose that lavender essential oil has an effect on test anxiety"
I have to draw a variable flow chart to show this relationship, however I am unsure weather to make the arrows go both ways (correlational) or only point to the right (causal).
The IV is the inhalation of essential lavender oil, and the DV is the test anxiety.|||I would go with a correlation diagram. Although there is some scientific evidence of the benefits of lavender oil, causation is not likely to be proved.
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